Does the Smart City-Coupe fail the MOT on noise, emissions and leaks more than it should?
The Smart City-Coupe records 12.49 noise, emissions and leaks failure items per 100 initial MOT tests (2019–2024), against 8.89 expected for a car of the same age mix: more than expected for its class and age (+3.60, 95% interval +3.26 to +3.94). It ranks 57 of 678 models on noise, emissions and leaks (1 = most failures above expected).
Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on noise, emissions and leaks · check a Smart City-Coupe by registration
What exactly fails on noise, emissions and leaks?
The most frequent DVSA defect wording in this group on the Smart City-Coupe is “Lambda coefficient outside the default limits or the range specified by the manufacturer”, recorded 1,813 times in 2019–2024.
| DVSA defect wording | Items | Per 100 tests |
|---|---|---|
| Lambda coefficient outside the default limits or the range specified by the manufacturer | 1,813 | 4.34 |
| Emissions levels exceed default limits | 1,193 | 2.85 |
| Emissions levels exceed the manufacturer's specified limits | 610 | 1.46 |
| Emissions test unable to be completed | 489 | 1.17 |
| Engine MIL illuminated indicating a malfunction | 459 | 1.10 |
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 41,807 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
If a Smart City-Coupe gets a noise, emissions and leaks advisory, how often does it fail next time?
11.2% of Smart City-Coupe MOTs with a noise, emissions and leaks advisory were followed by a fail in the same group at the next MOT, typically 12.1 months and 2,192 miles later (3,017 advisories followed).
Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 3,017 (advisories followed) · Method: the same vehicles followed to their next ordinary MOT · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV
Other pages for this model
Smart City-Coupe 2000 · Smart City-Coupe 2001 · Smart City-Coupe 2002 · Smart City-Coupe 2003 · Smart City-Coupe 2004 · Smart City-Coupe 2005 · Smart City-Coupe 2006 · Smart City-Coupe 2007 · Smart City-Coupe 2008 · Smart City-Coupe 2009 · Smart City-Coupe 2010 · Smart City-Coupe by postcode area · Smart City-Coupe body, chassis and structure failures · Smart City-Coupe brakes failures · Smart City-Coupe vehicle identification failures · Smart City-Coupe lamps, reflectors and electrics failures · Smart City-Coupe road wheels failures · Smart City-Coupe seat belts and airbags failures · Smart City-Coupe steering failures · Smart City-Coupe suspension failures · Smart City-Coupe tyres failures · Smart City-Coupe visibility failures